| Sep 15, 2026 SForm 4 → | Sep 15, 5:50 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,400 | $9.21 | $22,104 | 36,200 | −6.22% | |
| Jun 15, 2026 SForm 4 → | Jun 15, 4:24 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,400 | $17.01 | $40,824 | 38,600 | −5.85% | |
| Mar 6, 2019 SForm 4 → | Mar 6, 3:22 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,400 | $48.92 | $117,418 | 28,800 | −7.69% | plan? |
| Dec 6, 2018 SForm 4 → | Dec 7, 9:20 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $46.68 | $140,043 | 31,200 | −8.77% | plan? |
| Sep 6, 2018 SForm 4 → | Sep 6, 5:14 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $54.98 | $164,928 | 34,200 | −8.06% | plan? |
| Jun 6, 2018 SForm 4 → | Jun 6, 2:40 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $52.63 | $157,896 | 37,200 | −7.46% | plan? |
| Mar 6, 2018 SForm 4 → | Mar 6, 3:16 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $43.36 | $130,081 | 40,200 | −6.94% | plan? |
| Feb 21, 2018 AForm 4 → | Feb 22, 4:50 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 9,600 | — | — | 43,200 | — | plan? |
| Dec 6, 2017 SForm 4 → | Dec 6, 5:31 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $44.54 | $133,632 | 33,600 | −8.20% | plan? |
| Sep 5, 2017 SForm 4 → | Sep 5, 4:01 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $46.45 | $139,350 | 36,600 | −7.58% | plan? |
| Jun 5, 2017 SForm 4 → | Jun 5, 3:39 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $40.80 | $122,400 | 39,600 | −7.04% | plan? |
| May 3, 2017 AForm 4 → | May 3, 4:19 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 9,600 | — | — | 42,600 | — | plan? |
| Mar 3, 2017 SForm 4 → | Mar 6, 10:57 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $40.95 | $122,850 | 33,000 | −8.33% | plan? |
| Dec 5, 2016 SForm 4 → | Dec 5, 4:53 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.15 | $36,150 | 36,000 | −2.70% | plan? |
| Nov 3, 2016 SForm 4 → | Nov 3, 2:10 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.00 | $35,000 | 37,000 | −2.63% | plan? |
| Oct 5, 2016 SForm 4 → | Oct 5, 12:03 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.17 | $35,170 | 38,000 | −2.56% | plan? |
| Sep 6, 2016 SForm 4 → | Sep 6, 1:15 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.17 | $36,170 | 39,000 | −2.50% | plan? |
| Aug 3, 2016 SForm 4 → | Aug 3, 2:58 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $42.15 | $42,150 | 40,000 | −2.44% | plan? |
| Jul 5, 2016 SForm 4 → | Jul 5, 12:00 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $40.30 | $40,300 | 41,000 | −2.38% | plan? |
| Jun 3, 2016 SForm 4 → | Jun 3, 11:53 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.90 | $39,900 | 42,000 | −2.33% | plan? |
| May 4, 2016 ASForm 4 → | May 5, 12:22 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 13,000 | $38.57 | $38,570 | 43,000 | — | plan? |
| Apr 5, 2016 SForm 4 → | Apr 5, 3:07 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.20 | $39,200 | 32,000 | −3.03% | plan? |
| Mar 3, 2016 SForm 4 → | Mar 3, 2:34 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.93 | $36,930 | 33,000 | −2.94% | plan? |
| Feb 3, 2016 SForm 4 → | Feb 3, 12:22 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.70 | $33,700 | 34,000 | −2.86% | plan? |
| Jan 8, 2016 SForm 4 → | Jan 8, 6:38 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.63 | $33,630 | 35,000 | −2.78% | plan? |
| Dec 3, 2015 SForm 4 → | Dec 3, 4:10 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.77 | $33,770 | 36,000 | −2.70% | plan? |
| Nov 5, 2015 SForm 4 → | Nov 5, 4:34 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.75 | $36,750 | 37,000 | −2.63% | plan? |
| Oct 5, 2015 SForm 4 → | Oct 5, 11:19 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $27.52 | $27,520 | 38,000 | −2.56% | plan? |
| Sep 3, 2015 SForm 4 → | Sep 3, 2:38 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $27.28 | $27,280 | 39,000 | −2.50% | plan? |
| Aug 5, 2015 SForm 4 → | Aug 5, 5:12 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.56 | $31,560 | 40,000 | −2.44% | plan? |
| Jul 6, 2015 SForm 4 → | Jul 6, 5:11 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $32.70 | $32,700 | 41,000 | −2.38% | plan? |
| Jun 3, 2015 SForm 4 → | Jun 3, 4:05 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.11 | $31,110 | 42,000 | −2.33% | plan? |
| May 5, 2015 SForm 4 → | May 5, 1:28 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.10 | $35,100 | 43,000 | −2.27% | plan? |
| Apr 6, 2015 SForm 4 → | Apr 7, 2:53 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.35 | $35,350 | 44,000 | −2.22% | plan? |
| Mar 4, 2015 SForm 4 → | Mar 4, 4:38 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.92 | $35,920 | 45,000 | −2.17% | plan? |
| Feb 4, 2015 SForm 4 → | Feb 4, 6:13 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $37.50 | $37,500 | 46,000 | −2.13% | plan? |
| Jan 9, 2015 SForm 4 → | Jan 9, 2:05 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.90 | $33,900 | 47,000 | −2.08% | plan? |